Between November 2009 and April 2010 Oxford Archaeology (OA) carried out an archaeological watching brief at Park House, Horton Lane, Horley, Oxfordshire (NGR: SP 417 439). The work was commissioned by Mr David Marriott in advance of the proposed conversion of an existing barn to a studio and utility room and a proposed orangery. The watching brief revealed evidence of the construction of the barn undergoing conversion, an associated cobbled yard surface, a possible terrace wall and the original topology of the yard. No evidence for any earlier phases of Park House was observed.